Cutter head



Jan. 12, 1937. c. A. MEISEL CUTTER HEAD Filed May 4, 1934 1320882503".-I flfiawies v.7. Netsei;

A u Q I QII/37 Patented Jan. 12, 1937 UNEE'ED iATE PATENT OFFIQE CUTTERHEAD Application May 4, 1934, Serial No. 723,849

3 Claims.

This invention relates to cutter heads and the object is to provide aconstruction embodying improved means for adjusting the knives of thehead.

My invention will be well understood by reference to the followingdescription of an illustrative embodiment thereof shown by Way ofexample in the accompanying drawing, wherein:

Fig. 1 is a front elevation of a cutter head of the type adapted forperforating paper;

Fig. 2 is a section on the line 2--2 of Fig. 1 showing in section also acooperating element of the perforating mechanism; and

Fig. 3 is a section on the line 33 of Fig. 1.

I have here shown as an example of my invention a cutter mechanism asutilized in perforating paper, as, for example, in the production oflabels or stamps in a printing press. Such a mechanism may, as best seenin Fig. 2, comprise a fixed knife 5 disposed at an angle to the web w ofpaper and presenting its serrated edge beneath the same. The knife ishere shown as supported on a suitable seat on a frame member l by meansof clamping screws 9 and adjusting screws H. The edges of knives it,carried by the rotary cutter head 15 disposed at the other side of thepaper web, cooperate with the edge of knife 5. In a device of this typea nice adjustment of the edge of the knives is required to permit aclean and uniform perforation, and in accordance with my invention Iprovide efficient and simple means for effecting such adjustment.

The knives it here rest on the cutter head IE on suitable seats llcorresponding to chords of the cylinder and are secured, as best seen inFig. 3, by substantially radial clamping screws it, the openings in theknives which receive these screws being larger than the screwsthemselves to permit of desired variation in position of the knives. Therear of the seat may present a flange 21 forming an abutment opposingthe rear of the knife for a purpose to be described. At suitableintervals along the seat keys 23 let into the body of the head projectfrom the same, the knife having recesses 25 loosely receiving the keys.

Adjusting screws 27 are tapped into the rear of the knife throughopenings intersecting the recesses 25 and have heads opposing the flange2 i. In one use of these adjusting screws they are backed out to engagethe flange to adjust the knife outwardly from the latter. Such aposition is shown in the case of the upper and lower knives in Fig. 2.Alternatively, if in use it appears that a knife apparently perfectlyadjusted does not cut uniformly cleanly along its length,

an opposed localized adjustment may be effected by turning a screw inthe opposite direction so that its end engages a key 23, tending to pullthe knife inwardly. This position is shown in the case of the laterallydisposed knives in Fig. 2 and in the case of alternate screws seen inFig. 1. Thus, referring to the left-hand portion of Fig. 1 indicatingwhat may be considered a normal use of this adjustment, the screwintersected by the section line 2-2 tends to push outwardly the portionof the blade between the two adjusting screws at either side thereofwhich are in engagement with the flange 2|. Presumably the effect ofsuch an adjustment is a minute localized springing of the knife edge,but it has been found in practice effective to obtain a desireduniformity of cut.

It will be noted that I provide in the screws 2! a single set of deviceshaving a double or alternative function. The adjusting means is simpleand effective and provides for adjustment of the knife as a whole and alocal correction of inaccuracies arising from such adjustment.

I am aware that the invention may be embodied in other specific formswithout departing from the spirit or essential attributes thereof, and Itherefore desire the present embodiment to be considered in all respectsas illustrative and not restrictive; reference being had to the appendedclaims rather than to the foregoing description to indicate the scope ofthe invention.

I claim:

1. A cutter head having a knife seat presenting an abutment at the rearthereof and projections therefrom, a knife resting on the seat havingrecesses freely receiving the projections, adjusting screws threaded inthe knife and adapted alternatively to contact said abutment or saidprojections, and means for clamping the knife to the seat.

2. A cutter head having a knife seat corresponding substantially to achord of a cylinder, a knife, substantially radial screws for securingthe knife to its seat, and devices physically connected with the knifeand cooperating with the cutter head alternatively to move the knife inor out on seat.

3. A cutter head having a knife seat corresponding substantiallytoachord of a cylinder and presenting opposed abutments along the lengththereon, a knife, adjusting screws physically connected with the knifeto be received between said abutments for alternative engagementtherwith, and means for clamping the knife to the seat.

CHARLES A. MEISEL.

